From 3cb83e46d032505016ab2565f067e24c8cba9a9d Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@citrix.com>
Date: Tue, 7 Jan 2014 11:44:32 +0000
Subject: [PATCH] x86/xen: compactly store large identity ranges in the p2m

Large (multi-GB) identity ranges currently require a unique middle page
(filled with p2m_identity entries) per 1 GB region.

Similar to the common p2m_mid_missing middle page for large missing
regions, introduce a p2m_mid_identity page (filled with p2m_identity
entries) which can be used instead.

set_phys_range_identity() thus only needs to allocate new middle pages
at the beginning and end of the range.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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